diff options
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/video/gspca/gspca.c | 12 | ||||
| -rw-r--r-- | drivers/media/video/gspca/gspca.h | 1 |
2 files changed, 8 insertions, 5 deletions
diff --git a/drivers/media/video/gspca/gspca.c b/drivers/media/video/gspca/gspca.c index ed18401fd8ba..66e91d896eda 100644 --- a/drivers/media/video/gspca/gspca.c +++ b/drivers/media/video/gspca/gspca.c @@ -474,14 +474,14 @@ static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev) i = gspca_dev->alt; /* previous alt setting */ /* try isoc */ - while (--i > 0) { /* alt 0 is unusable */ + while (--i >= 0) { ep = alt_xfer(&intf->altsetting[i], USB_ENDPOINT_XFER_ISOC); if (ep) break; } - /* if no isoc, try bulk */ + /* if no isoc, try bulk (alt 0 only) */ if (ep == NULL) { ep = alt_xfer(&intf->altsetting[0], USB_ENDPOINT_XFER_BULK); @@ -489,6 +489,8 @@ static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev) err("no transfer endpoint found"); return NULL; } + i = 0; + gspca_dev->bulk = 1; } PDEBUG(D_STREAM, "use alt %d ep 0x%02x", i, ep->desc.bEndpointAddress); @@ -515,7 +517,7 @@ static int create_urbs(struct gspca_dev *gspca_dev, /* calculate the packet size and the number of packets */ psize = le16_to_cpu(ep->desc.wMaxPacketSize); - if (gspca_dev->alt != 0) { /* isoc */ + if (!gspca_dev->bulk) { /* isoc */ /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */ psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3)); @@ -615,7 +617,7 @@ static int gspca_init_transfer(struct gspca_dev *gspca_dev) goto out; /* clear the bulk endpoint */ - if (gspca_dev->alt == 0) /* if bulk transfer */ + if (gspca_dev->bulk) usb_clear_halt(gspca_dev->dev, gspca_dev->urb[0]->pipe); @@ -628,7 +630,7 @@ static int gspca_init_transfer(struct gspca_dev *gspca_dev) gspca_dev->streaming = 1; /* some bulk transfers are started by the subdriver */ - if (gspca_dev->alt == 0 && gspca_dev->cam.bulk_nurbs == 0) + if (gspca_dev->bulk && gspca_dev->cam.bulk_nurbs == 0) break; /* submit the URBs */ diff --git a/drivers/media/video/gspca/gspca.h b/drivers/media/video/gspca/gspca.h index 6f172e9e5fe9..e4d4cf6ce05a 100644 --- a/drivers/media/video/gspca/gspca.h +++ b/drivers/media/video/gspca/gspca.h @@ -167,6 +167,7 @@ struct gspca_dev { __u8 iface; /* USB interface number */ __u8 alt; /* USB alternate setting */ __u8 nbalt; /* number of USB alternate settings */ + u8 bulk; /* image transfer by 0:isoc / 1:bulk */ }; int gspca_dev_probe(struct usb_interface *intf, |